Refer to the figure. Portions of three biosynthetic pathways regulated through feedback inhibition and activation are shown. Two of these pathways intersect at carbamoyl phosphate. The third pathway generates a product that activates production of carbamoyl phosphate through allosteric modification of the enzyme carbamoyl phosphate synthetase. Arginine pathway Pyrimidine pathway Purine pathway Glutamate СТР N-acetylglutamate synthetase N-acetylglutamate UMP UMP ATCase CO2 + ATP + Gln Ornithine СР Carbamoyl phosphate synthetase t-Arginine In this set of pathways, arginine biosynthesis is shut down through feedback inhibition when and arginine reach high levels of concentration. О СТР O ornithine O UMP O carbamoyl phosphate O glutamate

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Metabolic pathways

Metabolism is defined as the group of life-supporting, enzyme-mediated chemical reactions in organisms. A metabolic pathway is a set of these chemical reactions that involve anabolism (synthesis of complex biomolecules) and catabolism (breakdown of biomolecules into small molecules) that occur inside a cell. Metabolites are the reacting substances, products, and intermediate substances of an enzymatic process that are altered by a series of chemical events catalyzed by enzymes.